diff --git a/src/components/features/ChatInput.tsx b/src/components/features/ChatInput.tsx
index 2002cb8..588c5c6 100644
--- a/src/components/features/ChatInput.tsx
+++ b/src/components/features/ChatInput.tsx
@@ -88,7 +88,7 @@ export function ChatInput({
     <div className={cn('w-full max-w-[var(--input-max-width)] mx-auto', className)}>
       <div
         className={cn(
-          'relative flex flex-col bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded-[18px] p-4 shadow-[var(--shadow-input)]',
+          'relative flex flex-col bg-[var(--color-bg-primary)] border border-[var(--color-border)] rounded-md p-4 shadow-[var(--shadow-input)]',
           'transition-all duration-150',
           'focus-within:border-[var(--color-border-focus)] focus-within:shadow-[var(--shadow-input-focus)]',
           isDragging && 'border-[var(--color-primary)] border-2 bg-[var(--color-primary)]/5'
@@ -100,7 +100,7 @@ export function ChatInput({
       >
         {/* 拖拽覆盖层 */}
         {isDragging && (
-          <div className="absolute inset-0 z-10 flex flex-col items-center justify-center bg-[var(--color-bg-primary)]/90 rounded-[18px] border-2 border-dashed border-[var(--color-primary)]">
+          <div className="absolute inset-0 z-10 flex flex-col items-center justify-center bg-[var(--color-bg-primary)]/90 rounded-md border-2 border-dashed border-[var(--color-primary)]">
             <Upload className="w-8 h-8 text-[var(--color-primary)] mb-2" />
             <p className="text-sm font-medium text-[var(--color-primary)]">
               释放以添加文件
diff --git a/src/components/features/MessageBubble.tsx b/src/components/features/MessageBubble.tsx
index 24ecac1..cc9e810 100644
--- a/src/components/features/MessageBubble.tsx
+++ b/src/components/features/MessageBubble.tsx
@@ -152,7 +152,7 @@ export function MessageBubble({ message, user, thinkingContent, isStreaming, err
               })}
             </div>
           )}
-          <div className="bg-[var(--color-message-user)] text-[var(--color-text-primary)] px-4 py-3 rounded-[18px] text-base leading-relaxed">
+          <div className="bg-[var(--color-message-user)] text-[var(--color-text-primary)] px-4 py-3 rounded-md text-base leading-relaxed">
             {message.content || ((uploadedImages && uploadedImages.length > 0) || (uploadedDocuments && uploadedDocuments.length > 0) ? '(附件)' : '')}
           </div>
           {/* 悬停显示复制按钮 */}
@@ -233,7 +233,7 @@ export function MessageBubble({ message, user, thinkingContent, isStreaming, err
         )}
 
         {/* 主要内容 */}
-        <div className="bg-[var(--color-message-assistant-bg)] border border-[var(--color-message-assistant-border)] rounded-2xl px-5 py-4 shadow-sm">
+        <div className="bg-[var(--color-message-assistant-bg)] border border-[var(--color-message-assistant-border)] rounded-md px-5 py-4 shadow-sm">
           <div className="text-sm text-[var(--color-text-primary)] leading-[1.75]">
             {message.content ? (
               <MarkdownRenderer content={message.content} />